A newly discovered zero-day vulnerability in the widely used Java logging library Apache Log4j is easy to exploit and enables attackers to gain full control of affected servers.

There are 17,000 unpatched Log4j packages in the Maven Central ecosystem, leaving massive supply-chain risk on the table from Log4Shell exploits.

The maintainers of the Java Log4j project had only three sponsors, despite the software being a crucial part of large companies' commercial products and enterprise applications.